Retainer scheme for cutting tool
US5503463A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1994 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Dec 23, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C35/197
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A cutting tool assembly including a cutting bit having a head and a cylindrical shank portion of substantially constant diameter depending from the head as well as a bit holder including a cylindrical bore for receiving the cylindrical shank portion of the cutting bit. The shank portion includes an annular recessed groove, the cylindrical bore includes a notch corresponding to and disposed opposite the annular recessed groove. The cutting tool assembly further includes a retainer sleeve disposed between the shank portion of the cutting bit and the bore of the bit holder and which closely conforms about the shank portion while allowing the shank portion to rotate within the bore. The retainer sleeve includes at least one inwardly prestressed projection closely following the contour of a portion of the recessed groove and at least one outwardly prestressed finger projecting into the notch in a direction opposite the inwardly prestressed projection to retain the cutting bit within the bore of the bit holder and to prevent axial removal of the cutting bit when in use while allowing rotational movement of the cutting bit within the bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.